I have a 91 CRX with a 94 Ex Vtec motor. My temp gauge rarely ever rises even after I have been driving for a couple of hours. But when I sit in traffic for a little while then my temp gauge rises to where it should be then when I start moving again the gauge goes all the way back down. Then sometimes while I am driving the needle just all the sudden begins rising to the top and I have to pull over and let it cool down then its normal again. The other problem that I have is that no coolant ever goes into my overflow tank. Does anyone know that problem. Thanks.